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| Titel |
Atmospheric nutrient inputs to the northern levantine basin from a long-term observation: sources and comparison with riverine inputs |
| VerfasserIn |
M. Koçak, N. Kubilay, S. Tuğrul, N. Mihalopoulos |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 12 ; Nr. 7, no. 12 (2010-12-17), S.4037-4050 |
| Datensatznummer |
250005107
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| Publikation (Nr.) |
 copernicus.org/bg-7-4037-2010.pdf |
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| Zusammenfassung |
| Aerosol and rainwater samples have been collected at a rural site located on
the coastline of the Eastern Mediterranean, Erdemli, Turkey between January
1999 and December 2007. Riverine sampling was carried out at five Rivers
(Ceyhan, Seyhan, Göksu, Berdan and Lamas) draining into the Northeastern
Levantine Basin (NLB) between March 2002 and July 2007. Samples have been
analyzed for macronutrients of phosphate, silicate, nitrate and ammonium
(PO43−, Sidiss, NO3− and NH4+). Phosphate
and silicate in aerosol and rainwater showed higher and larger variations
during the transitional period when air flows predominantly originate from
North Africa and Middle East/Arabian Peninsula. Deficiency of alkaline
material have been found to be the main reason of the acidic rain events
whilst high pH values (>7) have been associated with high Sidiss
concentrations due to sporadic dust events. In general, lowest nitrate and
ammonium concentrations in aerosol and rainwater have been associated with
air flow from the Mediterranean Sea. Comparison of atmospheric with riverine
fluxes demonstrated that DIN and PO43− fluxes to NLB have been
dominated by atmosphere (~90% and ~60% respectively)
whereas the input of Si was mainly derived from riverine runoff (~90%).
N/P ratios in the atmospheric deposition (233); riverine discharge
(28) revealed that NLB receives excessive amounts of DIN and this unbalanced
P and N inputs may provoke even more phosphorus deficiency. Observed molar
Si/N ratio suggested Si limitation relative to nitrogen might cause a switch
from diatom dominated communities to non-siliceous populations particularly
at coastal NLB. |
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